Hand-Held in Low Light: Rate These Lenses in Order

With all the new lenses coming out and my adoration of taking photos in low-light hand-held, I'd like to know what lenses to buy next (I left 7-14, 9-18, 17, etc off the list). I actually just ordered the Bower Fisheye for $200. Hope it arrives while Christmas lights are still up!

Too bad there's no calculator where I can put in sensor size, FL, and aperture to let me know minimum shutter speed. I rated these lenses in order of how easy I think they'd be to hand-hold wide-open in low-light. Feel free to correct me:

Well. That's easy - the shortest and brightest , so 12 or 20.
Not sure what body you will use but that matters too. Aside from Ibis which is great, soft shutter helps a lot IMO . I forgot to change IsO from 200 on X100 after some long exposures and continued taking hand held photos all night, most of which turned out just fin despite insanely slow speeds like 1/4 . probably due to soft no shock shutter on the x100.

Either you have amazing intuition or you did the math. Because I just did the math, and I think you are 100% right on that ordering. Although the 14/2.5 and the 20/1.7 are so close that it could be down to rounding errors. If they are in reality 14/2.47 and 20/1.73, that would be enough to make them swap order, so I would probably consider those two a draw.

Either you have amazing intuition or you did the math. Because I just did the math, and I think you are 100% right on that ordering. Although the 14/2.5 and the 20/1.7 are so close that it could be down to rounding errors. If they are in reality 14/2.47 and 20/1.73, that would be enough to make them swap order, so I would probably consider those two a draw.

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Really? No, I just guessed. You MUST teach me this math of which you speak! What's the formula? Thanks! Interesting about the 14 and the 20 too